!!!!??? It's happening again!

[asylumdown]

Originally Posted by mseepman

These are long shots but any chance something like a foreign object...maybe a metal clamp in a submerged area or even a penny could have got into the water? Are there power-heads in any of the tanks with magnet attachments that could maybe be rusting?

I've looked, I can't see anything obvious. the magnets on my MPs are all intact (I replaced one about 6 months ago that was looking worn), and the magnets on the various koralias in my sump all look brand new. That's why I want a commercial lab to test for heavy metals, I just can't figure this out.